RIGHT OUTER JOIN in PostgreSQL

by

Right Outer Join:
The Right Outer Join query after joining returns all the records from the Right table for the specified fields along with the records from the Left table where the join condition is met.

Syntax: 

SELECT expr_1, expr_2, ... expr_n  
FROM table_1   
RIGHT OUTER JOIN table_2  
ON join_predicate;

Parameters:
join_predicate: It is used to specify the joining conditions to be strictly followed for joining.

Example:
Employment Table:

ID STATE RATE
1 A 60
2 B 70
3 C 65
4 D 80
5 E 78

Department Table:

ID NAME PERCENT
1 IT 60
2 SALES 75
3 BANK 50

Query: 

SELECT “EMPLOYMENT”.“ID”, “EMPLOYMENT”.“STATE”, “DEPARTMENT”.“NAME”  
FROM “EMPLOYMENT”   
RIGHT OUTER JOIN “DEPARTMENT”  
ON “EMPLOYMENT”.“ID” = “DEPARTMENT”.“ID”;

Output:

ID STATE NAME
1 A IT
2 B Sales
    Bank

Explanation:
The EMPLOYMENT and the DEPARTMENT are the already existing tables that are joined with RIGHT OUTER JOIN query so that all the records from the DEPARTMENT table for the specified fields along with the records from the EMPLOYMENT table where the join condition is met is combined in the result set.